Chandra Cycle 8 Science Programs



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SOLAR SYSTEM                                      


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Proposal Number: 08100480            

Proposal Title: X-Ray Observations of Jupiter in Support of the New Horizons
Flyby

PI: G. Gladstone                   

Subject Category: SOLAR SYSTEM                                      

Abstract: On February 28th 2007, the New Horizons (NH) spacecraft will flyby
Jupiter for a gravity assist to Pluto. Closest approach (C/A) is 32 Jupiter
radii, but the NH instruments will conduct intensive studies from C/A-52d to
C/A+100d. Important new studies of auroral and magnetospheric physics are planned
that may be well-supported by Chandra observations. Chandra support of the
Cassini flyby of Jupiter in 2000 led to a major revision of our understanding of
Jupiter's x-ray aurora. We propose 108ks of Chandra time to support three planned
NH investigations; a time-variability study during approach, a multi-spectral
morphology study near C/A, and a magnetotail dynamics study as NH heads to Pluto.
In addition, we request 72ks of XMM-Newton time to investigate spectral
differences at low energy.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
                                Jupiter               ACIS-S    NONE    18.0000 
                                Jupiter               ACIS-S    NONE    18.0000 
                                Jupiter               ACIS-S    NONE    18.0000 
                                Jupiter               ACIS-S    NONE    18.0000 
                                Jupiter               ACIS-S    NONE    18.0000 
                                Jupiter               ACIS-S    NONE    18.0000 

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Proposal Number: 08100802            

Proposal Title: Solar wind charge exchange induced X-rays at Venus during the
Messenger flyby

PI: Konrad Dennerl                 

Subject Category: SOLAR SYSTEM                                      

Abstract: The interaction of the solar wind with planetary atmospheres has
important consequences for their evolution. This process can be studied
particularly well at Venus, because there the solar wind flow is not attenuated
by a planetary magnetic field and interacts directly with its atmosphere. The
discovery of cometary X-ray emission has demonstrated that charge exchange
induced X-rays of heavy solar wind ions can be used as an efficient tracer of low
density gas, offering a unique window on this interaction, with many diagnostic
qualities. We propose to utilize the exceptional opportunity provided by the
Messenger flyby in June 2007 and the presence of Venus Express for combining
local measurements with the global view provided by Chandra for a pioneering
X-ray study of this interaction.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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                                Venus                 ACIS-I    NONE    80.0000 


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NORMAL STARS AND WD                                      


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Proposal Number: 08200053            

Proposal Title: High Resolution Studies of Pre-Main Sequence Stars in Orion

PI: Claude Canizares               

Subject Category: STARS AND WD                                      

Abstract: The Trapezium Cluster at the center of the Orion Nebula Cluster (ONC)
is one of the youngest and closest (440 pc) star-forming regions. Many of the
properties we know today are derived from X-ray signatures. Here we study highly
resolved X-ray spectra of a large ensemble of very young and chemically similar
PMS stars in terms of their magnetic and accretion properties. This is the second
of three installments of our Orion HETG program, the first one was for 100 ks in
AO6, a third one for 150 ks will follow in AO9. In these pointings we add more
counts to our current sample of Orion stars, which so far include 4 spectra of
massive Trapezium stars and 2 late-type PMS stars. A series of 6 pointings will
result in at least 6 additional PMS spectra and higher quality Trapezium
spectra.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  05:35:16.10  -05:21:09.50     Orion Trapezium Clus  ACIS-S    HETG    25.0000 
  05:35:16.80  -05:24:04.20     Orion Trapezium Clus  ACIS-S    HETG    25.0000 
  05:35:17.20  -05:23:16.40     Orion Trapezium Clus  ACIS-S    HETG    25.0000 
  05:35:17.20  -05:21:31.70     Orion Trapezium Clus  ACIS-S    HETG    25.0000 
  05:35:18.00  -05:22:05.10     Orion Trapezium Clus  ACIS-S    HETG    25.0000 
  05:35:18.80  -05:22:45.90     Orion Trapezium Clus  ACIS-S    HETG    25.0000 

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Proposal Number: 08200106            

Proposal Title: THE FASTEST CORONA IN TOWN

PI: DAVID GARCIA-ALVAREZ           

Subject Category: STARS AND WD                                      

Abstract: The young (12 Myr) Beta Pic moving group member HD 199143 (F8V) has the
largest v sini of any known solar-like star accessible to Chandra gratings and
represents a unique opportunity to study surface magnetic and coronal structure
on a young solar analogue. Our proposed HETG+ACIS-S will probe the scale height
of the hot magnetised outer atmosphere coronal through Doppler rotational line
broadening. Rotationally-induced Doppler shifts will probe the presence of
dominant coronal features at lower latitudes. Provide plasma temperature
structure, density and chemical composition. The results will be used to
complement and test 3-D coronal models deduced from extrapolation of photospheric
magnetic fields from a contemporaneous Zeeman-Doppler imaging study.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  20:55:47.70  -17:06:51.00     HD 199143             ACIS-S    HETG    135.0000 

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Proposal Number: 08200110            

Proposal Title: Burn Out or Fade Away? Probing the X-ray Death of Intermediate
Mass Stars

PI: Jeremy Drake                   

Subject Category: STARS AND WD                                      

Abstract: We propose HRC-I snapshots of the very young early A-type stars HR4796A
(8 Myr) and beta Pic (~20 Myr) to search for remnant X-ray activity from the
Herbig Ae phase. Both stars have dusty disks and are in the epoch of planet
formation. They are the youngest A-type main-sequence stars for which accurate
ages have been determined, are devoid of stellar companions and are the best
available candidates to probe the mystery of how early A stars decline in X-ray
luminosity at least 100,000 fold from 10^31 erg/s to L_X < 10^26 erg/s in a few
million years. The results will be important for understanding the formation of
stars and planets at intermediate stellar masses, and the evolution of their high
energy environments and magnetic activity.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  12:36:01.00  -39:52:10.20     HR4796                HRC-I     NONE    20.0000 

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Proposal Number: 08200158            

Proposal Title: X-Ray Emission from Low-Mass Protostars in Small Dark Clouds

PI: Theodore Simon                 

Subject Category: STARS AND WD                                      

Abstract: A handful of Class I protostars have been detected in X rays, but no
firmly established Class 0 object has ever been detected as an X ray source. I am
proposing to obtain 60 ks pointings with the ACIS-I camera of four small dark
cloud regions, each of which is known to harbor high-velocity molecular outflows,
long chains of HH emission knots, and low-luminosity Class 0 IRAS sources. The
goal is to determine whether the X ray and other physical properties of these
objects are different from those of embedded protostars that form in much more
massive clouds. Because of their lower density and mass, these small clouds may
be more transparent to X rays and hence more easily probed than a dense cloud
like Orion.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  22:38:47.00  +75:11:30.00     L1251B-VLA3           ACIS-I    NONE    60.0000 

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Proposal Number: 08200171            

Proposal Title: A search for cool gas in the X-ray emitting wind of O-stars

PI: Ton Raassen                    

Subject Category: STARS AND WD                                      

Abstract: Pollock and Raassen developed a new paradigm for X-ray emission in
O-stars. It implies that the X-ray emission originates from proton-excitations
far out in the wind in an area with non-equilibrium plasma, while generally is
assumed that the X-rays are emitted in hot plasma in equilibrium near the stellar
surface. We use LETGS spectra to search for this cool gas in O-star wind
detectable by CV, OVI, NeVIII, MgVIII-MgX, SiIX-SiXII, SXII, SXIII, FeXVI above
37 Angstrom (the cut-off of XMM-Newton). Our first goal is to identify these
cooler (low-ionized) ions upto 80 Angstrom as indication for non-equilibrium
plasma. No O-stars have been studied extensively thusfar above 37 Angstrom. Delta
Ori is chosen, because of its low interstellar absorption.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  05:32:00.40  -00:17:56.70     delta Ori HD 36486    HRC-S     LETG    100.0000 

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Proposal Number: 08200188            

Proposal Title: Resolving the X-ray Emission from Massive Protostars in the NGC
2071 Cluster Core

PI: Stephen Skinner                

Subject Category: STARS AND WD                                      

Abstract: One of the most spectacular star-forming regions in Orion is the young
infrared cluster in NGC 2071. Its importance derives from the presence of several
massive protostars in a dense central subgroup known as NGC 2071-IR, which are
some of the closest such objects known. A recent XMM-Newton observation resulted
in the surprising detection of hard X-ray emission accompanied by a strong
fluorescent Fe I line from the central group of massive protostars. The emission
is likely associated with the massive embedded protostar IRS-1, which drives a
powerful bipolar outflow. We propose a follow-up Chandra observation that will
provide the high angular resolution needed to reliably identify IR counterparts
in the crowded cluster core and search for signatures of shock-related emission.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  05:47:04.80  +00:21:42.80     NGC2071-IRS1          ACIS-I    NONE    70.0000 

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Proposal Number: 08200206            

Proposal Title: Evolution of Magnetic Activity and the Accretion History in
Taurus-Auriga Multiple Systems

PI: Manuel Guedel                  

Subject Category: STARS AND WD                                      

Abstract: We request Chandra observing time to survey pre-main sequence binary
and multiple systems in the Taurus-Auriga Molecular Cloud (TMC) that can be
studied exclusively by Chandra. These systems show separations between components
in the range of ~1-5". TMC contains an anomalously high fraction of binaries and
is therefore a testbed for binary formation theories. X-ray studies provide
important diagnostics related to accretion processes and evolution of the TMC
sample. This Chandra project will be an integral part of a large, deep survey of
the TMC that has been conducted with the Spitzer Space Telescope, XMM-Newton, and
optical and near-infrared ground-based telescopes.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  04:03:49.20  +26:10:54.00     HBC 358/59            ACIS-S    NONE    10.0000 
  04:33:54.70  +26:13:28.00     IT Tau                ACIS-S    NONE    5.0000 

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Proposal Number: 08200213            

Proposal Title: Is W40 the Richest Nearby Young Stellar Cluster after Orion?

PI: Konstantin Getman              

Subject Category: STARS AND WD                                      

Abstract: There is now recent evidence that the poorly studied HII region W40 is
one of the richest young stellar clusters near the Sun. We propose a 40ks ACIS-I
Chandra exposure to study the underlying stellar population of W40. We will
detect the X-ray brighter, higher-mass individual members of the region down to
0.4Msun and, through XLF analysis, establish the population of undetected
lower-mass objects. Combining Chandra data with our deep JHK/H2 images obtained
at the UKIRT telescope on Mauna Kea will allow us information about the IMF of
cluster members, their protoplanetary disks, and protostars undergoing outflow
events. Likely being the richest star forming cloud within 600 pc after Orion,
W40 has the potential to offer us a different window to the formation processes
of stars in clusters.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  18:31:23.90  -02:05:29.50     W40                   ACIS-I    NONE    40.0000 

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Proposal Number: 08200263            

Proposal Title: Hot Gas in the Eskimo Nebula: Shocked Fast Stellar Wind or Fast
Collimated Outflows?

PI: Martin Guerrero                

Subject Category: STARS AND WD                                      

Abstract: It is commonly accepted that fast stellar winds and fast collimated
outflows are responsible for the shaping of planetary nebulae (PNe). Both fast
stellar winds and collimated outflows can produce shock-heated gas that emits
diffuse X-rays; thus, X-ray observations of PNe can be used to gain insight into
the formation and shaping of PNe. Few PNe, however, show detectable diffuse X-ray
emission and in only two cases this can be attributed to fast collimated
outflows. Our XMM-Newton observations of the Eskimo Nebula reveal diffuse X-ray
emission that may originate from both its fast stellar wind and from its bipolar
outflows. We request Chandra ACIS observations to resolve the X-ray emission from
the Eskimo Nebula and to determine its origin.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  07:29:10.80  +20:54:42.50     NGC 2392              ACIS-S    NONE    60.0000 

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Proposal Number: 08200400            

Proposal Title: Hot gas and cool dust around B[e] Supergiants

PI: Joel Kastner                   

Subject Category: STARS AND WD                                      

Abstract: We propose a joint Chandra/ACIS and Spitzer/IRS survey of plasma and
thermal dust emission from CI Cam and five other galactic B[e] supergiant systems
that are bright mid-IR sources. The results will test the hypothesis that many
such stars harbor quiescent, "CI Cam-like" X-ray sources, and that these sources
may be intimately related to the presence of binary companions as well as to the
dusty disks recently detected in IRS spectoscopy of B[e] supergiants. ACIS
spectrscopy will establish the presence and strength of any Fe fluorescence line
emission in these systems. In parallel, the proposed joint Spitzer IRS
observations will provide the means to ascertain the origin and evolution of
dusty disks around B[e] supergiants.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  10:15:21.90  -57:51:42.70     CPD -57 9243          ACIS-I    NONE    20.0000 
  16:07:02.00  -53:03:45.80     CPD -52 9243          ACIS-I    NONE    20.0000 
  17:15:15.30  -40:20:06.70     HD 327083             ACIS-I    NONE    20.0000 

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Proposal Number: 08200445            

Proposal Title: The shock physics at the colliding winds in WR 146

PI: Julian Pittard                 

Subject Category: STARS AND WD                                      

Abstract: WR+O star binary systems produce a region of hot shocked plasma where
the stellar winds collide - the wind-collision region (WCR). The hot plasma
produces thermal X-ray emission, while synchrotron radio emission arises from
relativistic electrons believed to be accelerated at the shocks bounding the WCR.
Such systems provide an excellent laboratory for the study of shock
thermalization and particle acceleration, with the same physical processes as
observed in SNRs, but at much higher mass, photon, and magnetic energy densities.
We propose an X-ray observation of WR146 to search for signs of weak shock
heating and shock modification, and to determine the non-thermal particle
distribution, providing insight into the nature of particle acceleration and its
feedback on the shock structure.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  20:35:47.10  +41:22:44.70     WR146                 ACIS-I    NONE    20.0000 

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Proposal Number: 08200495            

Proposal Title: Evolution of Accretion and X-Rays in Lynds 1228

PI: Manuel Guedel                  

Subject Category: STARS AND WD                                      

Abstract: We propose to observe two centers of low-mass star formation in the
Lynds 1228 dark cloud. L1228 is one of the most active star-formation regions
within the Cepheus giant molecular cloud complex. Recent Spitzer Space Telescope
observations have shown a wide variety of pre-main sequence stars at various
stages of evolution, ranging from embedded, jet+outflow driving protostars to
classical and weak-lined T Tauri stars with very different circumstellar-disk
characteristics. We aim at studying the influence of accretion and disk
parameters on X-ray production in a region with characteristics intermediate
between the Taurus and the Orion star-forming regions.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  20:57:11.70  +77:35:47.90     L1228 core            ACIS-I    NONE    40.0000 

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Proposal Number: 08200531            

Proposal Title: The Full Picture of Magnetic Activity in Ultracool Dwarfs:
Simultaneous Observations of Coronae and Chromospheres

PI: Edo Berger                     

Subject Category: STARS AND WD                                      

Abstract: Only a decade ago, theoretical expectation was that magnetic activity
would disappaer beyond M5. While we now know that stellar activity exists in some
late-M dwarfs, only a few such objects have been observed in the X-rays. Thus,
the ubiquity and physics of coronae and magnetic fields remain unclear. This is
exacerbated by the shift to flaring emission, whose properties are poorly
characterized due to the lack of simultaneous observations. It is therefore time
to produce a complete picture of the coronae and chromospheres in ultracool
dwarfs, and directly implicate magnetic fields in this activity. Here we propose
to delineate the underlying physics of the magnetic activity with fully
simultaneous observations in the X-ray, radio, and H-alpha bands.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  15:01:08.20  +22:50:02.00     TVLM513-46546         ACIS-S    NONE    30.0000 
  16:55:35.40  -08:23:42.30     VB8                   ACIS-S    NONE    30.0000 
  19:16:57.70  +05:09:00.00     VB10                  ACIS-S    NONE    30.0000 

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Proposal Number: 08200549            

Proposal Title: Understanding X-ray super-saturation

PI: Gaitee Hussain                 

Subject Category: STARS AND WD                                      

Abstract: X-ray emission is commonly used to measure magnetic activity in cool
stars. While X-ray levels and magnetic activity levels rise with stellar rotation
rate, X-ray luminosities actually decline or "super-saturate" in the most rapidly
rotating stars. Conflicting theories have been used to explain this: e.g.,
magnetic dynamos are inhibited, surface fields are more confined or their heating
is less efficient, or emission is reduced due to centrifugal stripping of the
outer corona. We will test different explanations of super-saturation through a
multi-wavelength study of the star, AP 139. By comparing rotational modulation in
its X-ray lightcurves and temperatures with maps of surface activity we can learn
if and how this phenomenon is related to changes in the star's surface fields.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  03:22:06.00  +47:34:07.50     AP 139                ACIS-S    NONE    69.0000 

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Proposal Number: 08200589            

Proposal Title: X-ray spectral diagnostics of accretion processes in pre-main
sequence stars: TWA14

PI: Paola Testa                    

Subject Category: STARS AND WD                                      

Abstract: We propose to obtain a 160 ks Chandra LETG+ACIS-S spectrum of TWA14,
one of the very few accreting pre-main sequence stars easily accessible to
high-resolution spectroscopy, being in the nearby TW Hydrae Association and X-ray
bright. This observation will provide unique X-ray diagnostics of accretion and
grain depletion of accreting gas, and will determine the role of accretion and
star-disk interaction in the high energy emission of classical T Tauri stars.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  11:13:26.20  -45:23:42.70     TWA14                 ACIS-S    LETG    160.0000 

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Proposal Number: 08200625            

Proposal Title: The Fainting of Alpha Cen A

PI: Thomas Ayres                   

Subject Category: STARS AND WD                                      

Abstract: Alpha Centauri (G2V+K1V) is the nearest system of solar-like stars; the
primary has long been regarded a solar twin. Historical X-ray missions have been
able to separate the coronal point sources (14" apart in Y2000), although the
orbit now is closing rapidly and beyond 2006 can only be resolved by Chandra. The
35 year X-ray record has revealed striking long term changes in the Alpha Cen
coronae, likely related to analogs of the still mysterious solar sunspot cycle.
Recent work suggests that the K star is rising out of a cycle minimum, while the
G star has experienced a startling, unprecedented plunge in its X-ray luminosity
that calls into question our understanding of stellar dynamos. A deep LETGS
spectrum, and two short HRC-I snapshots, will build on this remarkable coronal
narrative.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
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  14:39:32.30  -60:50:02.00     Alpha Centauri        HRC-I     NONE    5.0000 
  14:39:32.30  -60:50:02.00     Alpha Centauri        HRC-I     NONE    5.0000 
  14:39:32.30  -60:50:02.00     Alpha Centauri        HRC-S     LETG    120.0000 

==========================================================================================


Proposal Number: 08200704            

Proposal Title: Accretion or a Corona? Definitive Observations of the Young
Accreting Star TW Hydrae

PI: Nancy Brickhouse               

Subject Category: STARS AND WD                                      

Abstract: We propose a 500 ks observation of the prototypical accreting young
star TW Hydrae to determine whether the X-ray emission is from a hot corona or an
accretion shock. In the short archival spectrum, O VII and Ne IX forbidden to
intercombination lines signal either extremely high densities that must be
associated with a shock, or photoexcitation by UV continuum emission. The
definitive measurement for the density is the analogous Mg XI line ratio. We will
also measure velocity shifts and line broadening, search for rotational
modulation, and determine elemental abundances using standard emission measure
distribution techniques. This deep spectrum will probe the density and structure
of the magnetic regions associated with the accretion process during star
formation.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  11:01:52.00  -34:42:16.90     TW Hya                ACIS-S    HETG    20.0000 
  11:01:52.00  -34:42:16.90     TW Hya                ACIS-S    HETG    160.0000 
  11:01:52.00  -34:42:16.90     TW Hya                ACIS-S    HETG    160.0000 
  11:01:52.00  -34:42:16.90     TW Hya                ACIS-S    HETG    160.0000 

==========================================================================================


Proposal Number: 08200733            

Proposal Title: Hot Gas and Thermal Conduction in Planetary Nebulae

PI: Robert Gruendl                 

Subject Category: STARS AND WD                                      

Abstract: Planetary nebulae (PNe) consist of the material ejected by stars with
masses less than 8-10 Msun near the end of their evolution. Shock-heated gas
fills the central cavity of PNe and should be detectable in X-rays. The few
existing detections of diffuse X-ray emission from PNe appear to suggest that the
X-ray luminosity and plasma temperature decrease as a PN evolves. We have used
FUSE detections of nebular OVI emission or absorption to identify 3x10E5 K gas
from the interface between a hot PN interior and its nebular shell to identify
PNe most likely to possess X-ray-emitting gas. We request Chandra observations of
two such PNe. These PNe have intermediate ages and can be used to study the role
of thermal conduction in PNe as well as better establish how the hot gas evolves
with time.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  05:27:28.00  -12:41:50.00     IC 418                ACIS-S    NONE    50.0000 
  19:44:48.00  +50:31:30.00     NGC 6826              ACIS-S    NONE    50.0000 

==========================================================================================


Proposal Number: 08200759            

Proposal Title: MAGNETIC FIELDS ON 'ALIEN DWARFS' - II : CORONAL ACTIVITY IN THE
ARCTURUS MOVING GROUP

PI: Alexander Brown                

Subject Category: STARS AND WD                                      

Abstract: The Arcturus Moving Group (AMG) is very likely a remnant of the merger
of a dwarf galaxy with the Milky Way Galaxy in the distant past. This
kinematically distinct group has members located very close to the Sun, allowing
study of coronal activity on very old stars that would typically not be possible.
We detected 2 AMG dwarfs with ACIS-S in Cycle 7 with L_x somewhat less than the
minimum solar L_x. We propose to observe three additional AMG dwarf members with
the aim of determining their X-ray luminosities, coronal temperatures, and the
effects of low metallicity on coronal spectra. Our targets have metallicities
between 0.4 and 0.04 solar, spectral types F9 - K0, and are at distances less
than 30 pc from the Sun.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  10:28:03.90  +48:46:59.40     HD90508               ACIS-S    NONE    25.0000 
  16:13:47.80  -57:34:23.70     HD145417              ACIS-S    NONE    35.0000 

==========================================================================================


Proposal Number: 08200767            

Proposal Title: Triggered Star-Formation in W5 East

PI: Marc Gagne                     

Subject Category: STARS AND WD                                      

Abstract: W5 is the easternmost portion of an enormous complex of HII regions,
star clusters and molecular clouds located at 2 kpc in the Perseus arm. Spitzer
mid-infrared images of the "Mountains of Creation" (the bright-rimmed cloud AFGL
4029) are a stunning demonstration of sequential star-formation. Class I
protostars are tightly clustered in three regions with slightly older T Tauri
stars dispersed about the clusters just ahead of the ionization front advancing
into and eroding the molecular cloud. The region is a zoo of high- and low-mass
young stellar objects, outflows and nebulae. We propose to image the three
clusters with ACIS to characterize X-ray emission from the YSOs, particularly the
Class III weak-lined T Tauri stars that cannot be identified through near- and
mid-infrared searches.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  03:01:31.40  +60:29:13.00     AFGL 4029             ACIS-I    NONE    85.0000 

==========================================================================================


Proposal Number: 08200787            

Proposal Title: The high-mass star forming region DR21

PI: Francesco Damiani              

Subject Category: STARS AND WD                                      

Abstract: We propose two 100-ksec ACIS-I observations of the extremely young,
dense, massive star-forming region DR21 in the Cygnus X complex. We aim at
studying how strongly the presence of a cluster of very young massive stars
influences the formation and early evolution of lower-mass cluster stars
(efficiently selected from ACIS X-ray images), and their circumstellar
environment (already being studied with Spitzer data). The DR21 region and the
nearby cluster DB16 are a very good laboratory for an observational study of
sequential/triggered star formation, to be compared with existing theoretical
pictures. We will perform X-ray spectral and variability analysis for the most
intense sources. We will also search for diffuse hot gas, found in star-forming
regions with similar chaaracteristics.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  20:39:00.70  +42:18:56.80     DR 21                 ACIS-I    NONE    100.0000 

==========================================================================================


Proposal Number: 08200821            

Proposal Title: Colliding Wind Geometry and Dynamics in Eta Carinae: A New Cycle

PI: Michael Corcoran               

Subject Category: STARS AND WD                                      

Abstract: X-rays from the supermassive star Eta Car are produced along a ``bow
shock'' due to the collision of the wind from the primary star with the faster
wind from a hotter, less luminous companion. The 2-10 keV X-ray emission is
unique since it's the only radiation which can be clearly localized in the system
and it acts as an in-situ probe of the primary star. With the tragic loss of the
X-ray Spectrometer on Suzaku, for the foreseeable future the HETGS is the only
instrument capable of diagnosing the line emission in this crucial spectral
region. We propose to obtain 1 HETGS spectrum of Eta Car in AO8 to compare to our
previous HETGS spectra and to provide a clearer measure of the change in the flow
as the star approaches periastron/X-ray maximum in January 2009.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  10:45:03.60  -59:41:04.30     Eta Car               ACIS-S    HETG    100.0000 

==========================================================================================


Proposal Number: 08200904            

Proposal Title: Deep Chandra Observations of The Nearest Globular Cluster:
Obtaining a Complete Sample of Primordial Binaries

PI: David Pooley                   

Subject Category: STARS AND WD                                      

Abstract: We propose to extend our ongoing efforts to understand the internal
dynamics of globular clusters by observing a primordial population of binaries in
M4. Our recent work has shown that the active main-sequence binaries in this
cluster are largely primordial, rather than dynamically formed (as the low mass
X-ray binaries and cataclysmic variables are). A deep Chandra observation will
uncover ~90% of this population. This will constitute the first nearly complete
and well-defined sample of primordial binaries in a globular cluster.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  16:23:35.50  -26:31:31.00     M4                    ACIS-S    NONE    50.0000 
  16:23:35.50  -26:31:31.00     M4                    ACIS-S    NONE    50.0000 

==========================================================================================


Proposal Number: 08200925            

Proposal Title: The Age of a Stellar System Surrounded by Colliding
Planetesimals

PI: Benjamin Zuckerman             

Subject Category: STARS AND WD                                      

Abstract: BD+20 307 is, by more than an order of magnitude, the dustiest main
sequence star known. The dust appears to have been produced by the violent
reduction of the equivalent of a ~300 km diameter object into tiny particles
within the last 1000 yr. Such events should be rare in something the age of our
solar system, but could have been much more common at earlier epochs. To gain
insight into the evolution of solar-type planetary systems, we are proposing to
constrain the age of BD +20 307 by measuring its X-ray luminosity.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  01:54:50.30  +21:18:22.50     BD +20 307            ACIS-S    NONE    5.0000 

==========================================================================================


Proposal Number: 08201040            

Proposal Title: Nature vs. Nurture: The influence of OB star environments on
proto-planetary disk evolution

PI: Jeroen Bouwman                 

Subject Category: STARS AND WD                                      

Abstract: We propose a combined IRAC/IRS study of a large, well-defined and
unbiased X-ray selected sample of pre-main-sequence stars in three OB
associations: Pismis 24 in NGC 6357, NGC 2244 in the Rosette Nebula, and IC 1795
in the W3 complex. The samples are based on recent Chandra X-ray Observatory
studies which reliably identify hundreds of cluster members and were carefully
chosen to avoid high infrared nebular background. A new Chandra exposure of IC
1795 is requested, and an optical followup to characterise the host stars is
planned.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  02:26:34.40  +62:00:43.00     IC 1795               ACIS-I    NONE    50.0000 


******************************************************************************************

 
WD BINARIES AND CV                                


******************************************************************************************

==========================================================================================


Proposal Number: 08300002            

Proposal Title: Monitoring the supersoft source state of many optical novae in
the core of M 31

PI: Wolfgang Pietsch               

Subject Category: WD BINARIES AND CV                                

Abstract: We propose to monitor the M31 core with four 23ks XMM-Newton EPIC and
four 20ks Chandra HRC-I observations equally distributed over AO5 to determine
the duration of the SSS state of optical novae. Detected sources will be
correlated with optical nova positions from the WeCAPP program covering the same
area. EPIC will determine the SSS nature of sources using hardness ratios, HRC-I
will enable continuous monitoring and separate nova candidates from bright X-ray
sources. With a nova rate in the field of ~25/yr and SSS phase sometimes lasting
for years we will simultaneously follow many nova light curves. The durations of
the nova SSS state will allow us to constrain envelope and WD masses. We will
also monitor time variability of ~200 M31 centre X-ray sources (mostly XRBs).

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  00:42:44.30  +41:16:09.40     M31                   HRC-I     NONE    20.0000 
  00:42:44.30  +41:16:09.40     M31                   HRC-I     NONE    20.0000 
  00:42:44.30  +41:16:09.40     M31                   HRC-I     NONE    20.0000 
  00:42:44.30  +41:16:09.40     M31                   HRC-I     NONE    20.0000 

==========================================================================================


Proposal Number: 08300134            

Proposal Title: Testing the Physics of Magnetic Accretion: EX Hydrae from the
Shock to the White Dwarf Surface

PI: Ronnie Hoogerwerf              

Subject Category: WD BINARIES AND CV                                

Abstract: We propose to observe the magnetic Cataclysmic Variable (CV) EX Hydrae
with the HETG to make a direct measurement of the temperature and density
structure of its accretion columns and study the physics of the shock and
subsequent cooling flow. The accretion column structure, crucial to our
understanding of accretion physics, remains one of the last unexplored components
of CVs and other accreting objects. The accretion columns of EX Hydrae are
unobscured and are periodically occulted by the body of the white dwarf, making
it the ideal target for this study. We will use high signal-to-noise light curves
for individual spectral lines to measure the temperature and density structure.
The result will be applicable to a broad range of objects from clusters of
galaxies to T Tauri stars.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  12:52:24.20  -29:14:56.70     EX Hydrae             ACIS-S    HETG    20.0000 
  12:52:24.20  -29:14:56.70     EX Hydrae             ACIS-S    HETG    160.0000 
  12:52:24.20  -29:14:56.70     EX Hydrae             ACIS-S    HETG    160.0000 
  12:52:24.20  -29:14:56.70     EX Hydrae             ACIS-S    HETG    160.0000 

==========================================================================================


Proposal Number: 08300374            

Proposal Title: Determining the population of Cataclysmic Variables in the
Globular Cluster NGC2808

PI: Remon Cornelisse               

Subject Category: WD BINARIES AND CV                                

Abstract: Close binaries, and in particular cataclysmic variables (CVs), play a
vital role in the dynamical evolution of globular clusters. It is, therefore,
important to understand the formation of these systems in the core of a cluster.
Here we propose to test the dynamical formation scenarios of CVs by observing NGC
2808 in the X-rays with Chandra. In combination with already existing FUV imaging
with the Hubble Space Telescope on this globular cluster it will be possible to
unambiguously identify the CVs, and thereby test the formation scenarios for the
first time.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  09:12:02.60  -64:51:46.20     NGC 2808              ACIS-I    NONE    60.0000 

==========================================================================================


Proposal Number: 08300601            

Proposal Title: X-ray Measures of Two New Double-Degenerate, Ultracompact AM CVn
Binaries

PI: Scott Anderson                 

Subject Category: WD BINARIES AND CV                                

Abstract: AM CVns are extremely rare double-degenerate cataclysmic variables,
encompassing the shortest-period binaries known. They are of high interest as
possible supernova progenitors, and especially as likely sources of gravity
waves. We have found five new AM CVns in the Sloan Digital Sky Survey (SDSS), a
very significant expansion of this elite subclass. We propose initial Chandra
flux measures for our two most recent discoveries (the others are slated for
cycle 7). Chandra data will constrain their mass accretion rates, a key parameter
in understanding the evolutionary interplay between mass-transfer and
gravitational radiation. The proposed observations will also sensitively assess
the feasibility of follow-on, more detailed X-ray timing and/or spectral
studies.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  12:08:42.00  +35:50:25.10     SDSS J1208+3550       ACIS-S    NONE    3.0000 
  14:11:18.30  +48:12:57.60     SDSS J1411+4812       ACIS-S    NONE    3.0000 

==========================================================================================


Proposal Number: 08300667            

Proposal Title: Supersoft Sources at Low Metallicity: SMC 13

PI: Thierry Lanz                   

Subject Category: WD BINARIES AND CV                                

Abstract: The identification of SN Ia progenitors remains elusive. A promising
channel leading to a SN Ia event involves accreting white dwarfs (WD) that
sustain steady nuclear burning. They are observed as close binary X-ray sources
with a supersoft spectrum (CBSS). We propose to obtain the first Chandra LETGS
spectrum of SMC 13, a CBSS in the SMC. From absorption line spectroscopy, we will
achieve significant advances in determing the properties of SMC 13 and provide
unique data to constrain new evolutionary calculations of accreting hot white
dwarfs. At low metallicities, the population of SN Ia progenitors shifts toward
systems with higher initial WD masses and lower mass donor stars. This difference
might turn out to be crucial to understanding the physics of local vs. distant SN
Ia.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  00:37:19.00  -72:14:14.00     SMC 13                HRC-S     LETG    90.0000 

==========================================================================================


Proposal Number: 08300712            

Proposal Title: X-ray Observation of a Transient Symbiotic-Star Jet

PI: Jennifer Sokoloski             

Subject Category: WD BINARIES AND CV                                

Abstract: Astrophysical jets are ubiquitous in the universe, yet the collimation
and acceleration mechanism for these outflows are unclear. Accretion disks,
however, are likely to play a key role. White dwarf have possibly the
best-understood disks, so symbiotic stars (SS), which are a recently identified
class of jet-producing objects, are promising targets. The two SS X-ray jets that
have been discovered to date (R Aqr and CH Cyg) both show X-ray structure more
extended than their radio jets. To further study the X-ray properties of SS jets,
most of which are transient, plus investigate changes in the central object when
a jet is ejected, we propose a Chandra TOO observation (slow turn-around) of the
next SS jet that is discovered. This proposal was accepted in AO5-AO7 but not
triggered.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
                                Transient Symbiotic-  ACIS-S    NONE    100.0000 

==========================================================================================


Proposal Number: 08300829            

Proposal Title: Primordial formation of close binaries in globular clusters with
low density cores

PI: Albert Kong                    

Subject Category: WD BINARIES AND CV                                

Abstract: The primordial binary population is a key input parameter for any
realistic model of dense star cluster dynamics. However, the number of primordial
binaries and its direct implications for the formation rate of close binaries
remain poorly understood. Theoretical calculations show that cataclysmic
variables can be formed directly from primordial binaries in or near the core of
low core density globular clusters. We propose to use Chandra/HST to study low
density core globular clusters systematically and to test the prediction that
low-luminosity X-ray sources can be formed from primordial binaries in the
cluster core. This project will complement our successful Chandra/HST program to
study the dynamical formation of X-ray sources in high core density globular
clusters.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  09:20:59.30  -77:16:57.00     E3                    ACIS-S    NONE    20.0000 
  16:27:14.10  -26:01:29.00     NGC6144               ACIS-S    NONE    60.0000 

==========================================================================================


Proposal Number: 08300851            

Proposal Title: RS Oph: Exploring the Site of a Recurrent Symbiotic Nova
Explosion

PI: Sumner Starrfield              

Subject Category: WD BINARIES AND CV                                

Abstract: RS Oph is a Recurrent Symbiotic Nova in which a white dwarf orbits
inside the outer atmosphere of a red giant and repeatedly explodes on human
timescales. Its last outburst began on 12 February 2006 and it is being observed
from X-ray wavelengths through to the radio. The X-ray emission is that of a
shock moving through the red giant atmosphere and RS Oph is evolving analogously
to that of a low-energy Type II Supernova explosion (but faster). By the
beginning of Cycle 8, it should be nearly to quiescence and we, therefore,
propose two 50 ksec grating observations, separated by about 6 months, in order
to study the hot white dwarf and the emission lines from the cooling gas.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  17:50:13.20  -06:42:28.50     RS Oph                HRC-S     LETG    20.0000 
  17:50:13.20  -06:42:28.50     RS Oph                HRC-S     LETG    40.0000 
  17:50:13.20  -06:42:28.50     RS Oph                HRC-S     LETG    40.0000 

==========================================================================================


Proposal Number: 08300935            

Proposal Title: Core Collapse Deep Survey: NGC6397

PI: Jonathan Grindlay              

Subject Category: WD BINARIES AND CV                                

Abstract: We propose an ultra-deep survey of the core collapse cluster NGC 6397.
At only 2.3kpc, it can be surveyed ~6X deeper (down to Lx=6E28 erg/s) than any
globular done with Chandra (e.g. 47Tuc) and with significantly reduced central
crowding. Combined with two very deep surveys (V~25-30) just conducted in HST
cycle 13, we shall provide the first, and only possible, globular cluster survey
for the lowest luminosity cataclysmic variables (CVs: AM CVns and Polars) and
millisecond pulsars (MSPs) known in the field. The doubly-recycled MSP (and a
second candidate) as well as magnetic CVs will be studied in detail. This compact
binary survey will provide a complete census and set of identifications of a
large fraction of the cluster's compact binaries, the central engine of core
collapse.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  17:40:42.00  -53:40:27.90     NGC6397               ACIS-S    NONE    90.0000 
  17:40:42.00  -53:40:27.90     NGC6397               ACIS-S    NONE    160.0000 

==========================================================================================


Proposal Number: 08301010            

Proposal Title: A grating spectrum of a bright nova in outburst

PI: Marina Orio                    

Subject Category: WD BINARIES AND CV                                

Abstract: We propose to observe a classical or recurrent nova in outburst with
the Chandra LETG grating, if it is observed to turn into a luminous supersoft
X-ray source using Swift. We also define alternative criteria to trigger the
observation in case an observation with XMM-Newton is possible. Our aims are: a)
Analyse the spectra of the hot white dwarf (WD) atmosphere, deriving effective
temperature, abundances and effective gravity, b) Assess how common it is to find
a significant leftover mass on the WD after a nova outburst, c) Measure the short
term variability due to non radial oscillations of the white dwarf, d) Possibly
also study the supersoft X-ray emission originating in the ejected nebula.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
                                A new nova            HRC-S     LETG    35.0000 


******************************************************************************************

 
BH AND NS BINARIES                                


******************************************************************************************

==========================================================================================


Proposal Number: 08400027            

Proposal Title: Localizing ill-studied LMXBs

PI: Mariano Mendez                 

Subject Category: BH AND NS BINARIES                                

Abstract: The goal is to localize several LMXBs with sub-arcsecond accuracy to
enable the identification of the optical counterpart, and to monitor RX
J1718-4029.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  09:24:18.10  -31:42:12.00     1RXS J092418.0-31421  HRC-I     NONE    1.0000 
  17:18:24.10  -40:29:33.00     1RXS J171824.2-40293  ACIS-S    NONE    2.5000 
  17:18:24.10  -40:29:33.00     1RXS J171824.2-40293  ACIS-S    NONE    2.5000 

==========================================================================================


Proposal Number: 08400031            

Proposal Title: Chandra follow-up of weak persistent sources found in INTEGRAL
maps

PI: Mariano Mendez                 

Subject Category: BH AND NS BINARIES                                

Abstract: We propose to obtain a 1 ksec exposure of up to 4 newly found
unclassified INTEGRAL sources which are weak persistent X-ray binaries (we
exclude from this proposal bright new transients discovered by INTEGRAL). The
unique Chandra positional capabilities will allow for an optical follow-up study.
Follow-up observations are of paramount importance for the classification of the
sources (e.g. as HMXBs/LMXBs, pulsars or in a few rare cases as AXP or DIM). The
timing capabilities of the HRC will allow us to search for (slow) pulsations in
case the compact object is a neutron star while pile-up which would complicate
source localization is no problem.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
                                IGR persisent weak T  HRC-I     NONE    1.0000 
                                IGR persisent weak T  HRC-I     NONE    1.0000 
                                IGR persisent weak T  HRC-I     NONE    1.0000 
                                IGR persisent weak T  HRC-I     NONE    1.0000 

==========================================================================================


Proposal Number: 08400032            

Proposal Title: Chandra follow-up of weak persistent sources

PI: Mariano Mendez                 

Subject Category: BH AND NS BINARIES                                

Abstract: We propose to obtain short exposures of a sample of unclassified
sources which are likely weak persistent X-ray binaries. The unique Chandra
positional capabilities will allow for an optical follow-up study. Follow-up
observations are of paramount importance for the classification of the sources
(e.g. as HMXBs/LMXBs, pulsars or in a few rare cases as AXP or DIM). The timing
capabilities of the HRC will allow us to search for (slow) pulsations in case the
compact object is a neutron star while pile-up which would complicate source
localization is no problem.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  16:48:06.90  -45:12:05.30     IGR J16479-4514       HRC-I     NONE    1.0000 
  17:59:46.00  -22:00:54.00     IGR J17597-2201       HRC-I     NONE    1.0000 
  18:48:17.00  -03:10:18.00     IGR J18483-0311       HRC-I     NONE    1.0000 

==========================================================================================


Proposal Number: 08400061            

Proposal Title: A Pilot Study of X-ray Emission from Candidate Massive Star
Clusters

PI: Gordon Garmire                 

Subject Category: BH AND NS BINARIES                                

Abstract: We propose to continue a pilot study by observing three candidate young
(< 10 Myr) clusters of massive (>20 Msun) stars for 10 ks apiece with ACIS-I. The
ages, initial mass functions, and total masses, will be determined as part of an
LTSA-funded project to study the populations of massive stars in 130 clusters
with the VLA, HST, SOFIA, Keck, and Gemini. The observations will (1) identify
pulsars, magnetars, and HMXBs, so that we can determine the masses of the
progenitors of compact objects, (2) reveal X-ray emisison from colliding-wind
binaries, so that we can constrain the binary fraction of massive stars, and (3)
measure diffuse X-rays from clusters with a variety of ages, so that we can
understand how the winds of the massive stars in clusters interact with their
surrounding ISM.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  01:06:45.00  +59:40:36.00     BDSB2003+50           ACIS-I    NONE    10.0000 
  04:11:10.00  +51:09:58.00     BDSB2003+65           ACIS-I    NONE    10.0000 
  04:36:50.00  +50:52:46.00     BDSB2003+66           ACIS-I    NONE    10.0000 

==========================================================================================


Proposal Number: 08400062            

Proposal Title: A Pilot Study of X-ray Emission from Candidate Massive Star
Clusters

PI: Gordon Garmire                 

Subject Category: BH AND NS BINARIES                                

Abstract: We propose to continue a pilot study by observing three candidate young
(< 10 Myr) clusters of massive (>20 Msun) stars for 10 ks apiece with ACIS-I. The
ages, initial mass functions, and total masses, will be determined as part of an
LTSA-funded project to study the populations of massive stars in 130 clusters
with the VLA, HST, SOFIA, Keck, and Gemini. The observations will (1) identify
pulsars, magnetars, and HMXBs, so that we can determine the masses of the
progenitors of compact objects, (2) reveal X-ray emisison from colliding-wind
binaries, so that we can constrain the binary fraction of massive stars, and (3)
measure diffuse X-rays from clusters with a variety of ages, so that we can
understand how the winds of the massive stars in clusters interact with their
surrounding ISM.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  04:40:39.00  +50:27:39.00     BDSB2003+67           ACIS-I    NONE    10.0000 
  06:15:53.00  +14:16:08.00     BDSB2003+81           ACIS-I    NONE    10.0000 
  06:57:15.00  -08:19:48.00     BDSB2003+93           ACIS-I    NONE    10.0000 

==========================================================================================


Proposal Number: 08400081            

Proposal Title: Chandra follow-up of weak persistent sources

PI: Mariano Mendez                 

Subject Category: BH AND NS BINARIES                                

Abstract: We propose to obtain short exposures of a sample of unclassified
sources which are likely weak persistent X-ray binaries. The unique Chandra
positional capabilities will allow for an optical follow-up study. Follow-up
observations are of paramount importance for the classification of the sources
(e.g. as HMXBs/LMXBs, pulsars or in a few rare cases as AXP or DIM). The timing
capabilities of the HRC will allow us to search for (slow) pulsations in case the
compact object is a neutron star while pile-up which would complicate source
localization is no problem.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  00:29:03.00  +59:34:19.00     IGR J00291+5934       ACIS-S    NONE    3.0000 
  07:50:35.30  -15:47:16.00     IGR J07506-1547       HRC-I     NONE    1.0000 
  11:11:25.00  -67:23:31.00     IGR J11114-6723       HRC-I     NONE    1.0000 
  16:19:25.90  -28:09:36.00     IGR J16194-2810       HRC-I     NONE    1.0000 
  16:50:01.20  -33:06:57.00     IGR J16500-3307       HRC-I     NONE    1.0000 
  17:43:00.20  -36:22:51.00     XTE J1743-363         HRC-I     NONE    1.0000 
  18:49:04.00  -00:01:30.00     IGR J18490-0000       HRC-I     NONE    1.0000 
  19:30:46.10  +05:30:07.00     IGR J19308+0530       HRC-I     NONE    1.0000 

==========================================================================================


Proposal Number: 08400113            

Proposal Title: A Red Giant Companion for the Transient 7.8 s Pulsar XTE
J1829-098 ?

PI: JULES HALPERN                  

Subject Category: BH AND NS BINARIES                                

Abstract: The transient 7.8 s pulsar XTE J1829-098 was discovered in a PCA scan
of the Galactic plane, and despite its serendipitous detection by XMM-Newton, we
have not been able to identify it optically with the expected Be star or OB
supergiant. Neither are its X-ray properties compatible with an anomalous X-ray
pulsar (magnetar). A more accurate Chandra position is needed to select among
plausible candidates around the XMM error circle, one of which is an extremely
cool M9-10 red giant, and apparently a long-period variable. If this star is the
companion of XTE J1829-098, it would be the coolest red giant/X-ray binary, and
its radial pulsations could cause episodic accretion onto the neutron star, whose
X-ray luminosity varies by at least a factor of 1000.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  18:29:44.10  -09:51:23.30     XTE J1829-098         ACIS-I    NONE    5.0000 
  18:29:44.10  -09:51:23.30     XTE J1829-098         ACIS-I    NONE    5.0000 
  18:29:44.10  -09:51:23.30     XTE J1829-098         ACIS-I    NONE    5.0000 

==========================================================================================


Proposal Number: 08400166            

Proposal Title: X-Ray Jets in Microquasars

PI: Stephane Corbel                

Subject Category: BH AND NS BINARIES                                

Abstract: We propose Target of Opportunity (ToO) observations for detailed
studies of X-ray jets from microquasars. We describe our discovery of radio/X-ray
jets in two microquasars, why X-ray jets are probably much more common than
previously thought, and transient X-ray jets offer an exciting new way to probe
the physics of relativistic jets from black holes. The proposed ToO observations
are optimized to discover and study (flux evolution, morphology, SED, proper
motion, ...) of new X-ray jets from microquasars, triggered by their detection as
radio lobes. This will have implications not only for the study of jets from
Galactic X-ray binaries, but also for our understanding of relativistic jets from
active galactic nuclei (AGN).

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
                                X-ray Jets            ACIS-S    NONE    30.0000 
                                X-ray Jets            ACIS-S    NONE    50.0000 
                                X-ray Jets            ACIS-S    NONE    60.0000 

==========================================================================================


Proposal Number: 08400356            

Proposal Title: High Resolution Spectroscopy of GRS 1915+105 in the 'Soft' State

PI: Yoshihiro Ueda                 

Subject Category: BH AND NS BINARIES                                

Abstract: We propose to perform a TOO observation of GRS 1915+105 in the soft
state with Chandra/HETGS. Investigation of iron-K absorption lines provide us
with powerful diagnostics of highly ionized plasma associated with the accretion
flow of microquasars. Although such features were discovered firstly from
superluminal sources, the nature of the highly ionized plasma in GRS 1915+105 and
its possible relation to relativistic jet ejection still remains unclear. This is
because the source stays mostly in the low/hard state, where the ions are fully
ionized by the strong hard X-ray flux and a very weak feature from H-like Fe ions
is observable. Previous ASCA observations indicate that the iron-K absorption
features become prominent in this state, thus best suited for detailed plasma
diagnostics.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  19:15:11.60  +10:56:44.90     GRS 1915+105          ACIS-S    HETG    50.0000 

==========================================================================================


Proposal Number: 08400359            

Proposal Title: Following a black hole candidate X-ray transient to quiescence

PI: Peter Jonker                   

Subject Category: BH AND NS BINARIES                                

Abstract: There is increasing evidence that the quiescent state of BH X-ray
binaries is different from the hard state that is observed at higher
luminosities. Our recent Chandra campaigns on BH transient decays suggest that a
transition takes place when the luminosity suddenly drops by almost three orders
of magnitude during a period of only a few weeks. This transition has so far not
been resolved, but there is strong evidence that the spectrum softens during this
rapid decay. Both the decay and spectral evolution can provide important
constraints for jet-dominated and ADAF-like models. We propose a more aggressive
program than before and request 6 simultaneous Chandra/VLA TOO observations that
aim to cover this rapid transition in full detail for the first time with X-ray
and radio observations.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
                                TOO                   ACIS-S    HETG    7.0000 
                                TOO                   ACIS-S    HETG    7.0000 
                                TOO                   ACIS-S    NONE    7.0000 
                                TOO                   ACIS-S    NONE    15.0000 
                                TOO                   ACIS-S    NONE    35.0000 
                                TOO                   ACIS-S    NONE    100.0000 

==========================================================================================


Proposal Number: 08400362            

Proposal Title: Quasi-persistent neutron-star X-ray binaries in quiescence

PI: Rudy Wijnands                  

Subject Category: BH AND NS BINARIES                                

Abstract: We propose to observe the next (quasi-)persistent neutron-star low-mass
X-ray binary that turns off and becomes quiescent. This will provide an excellent
opportunity to study the effects of prolonged accretion on the neutron-star
properties (i.e., crust and core and thus the properties of ultradense matter)
and the quiescent properties of low-mass X-ray binaries. Two follow-up
observations taken several months later will provide important information about
the time evolution of the quiescent properties. In particular, if indeed the
quiescent X-rays are emitted by the crust, we will be able to study its evolution
in time,thus setting strong constraints on the crust cooling models and the exact
structure of the crust.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
                                Quiescent source      ACIS-S    NONE    30.0000 
                                Quiescent source      ACIS-S    NONE    30.0000 
                                Quiescent source      ACIS-S    NONE    30.0000 

==========================================================================================


Proposal Number: 08400404            

Proposal Title: Chandra observations of the 2007 PSR B1259-63 periastron
passage.

PI: Maria Chernyakova              

Subject Category: BH AND NS BINARIES                                

Abstract: PSR B1259-63 is a unique binary system with a radio pulsar from which
unpulsed X-ray, Gamma-ray, and radio emission was observed. The pulsar is in a
highly eccentric 3.4 year orbit with a Be star. Collision of the pulsar wind with
the wind of Be star plays a crucial role in generation of the observed emission.
The goal of this proposal is to investigate spectral evolution of the system as
the pulsar passes through the Be star disk, and with the help of the received
data to reconstruct the physical processes governing the system.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  13:02:47.60  -63:50:08.70     PSR B1259-63          ACIS-S    NONE    3.0000 
  13:02:47.60  -63:50:08.70     PSR B1259-63          ACIS-S    HETG    5.0000 
  13:02:47.60  -63:50:08.70     PSR B1259-63          ACIS-S    HETG    5.0000 
  13:02:47.60  -63:50:08.70     PSR B1259-63          ACIS-S    HETG    7.0000 

==========================================================================================


Proposal Number: 08400470            

Proposal Title: Using Chandra to investigate the X-ray properties of the
enigmatic, bipolar TeV source HESS J1841-053

PI: Gerd Puehlhofer                

Subject Category: BH AND NS BINARIES                                

Abstract: From a population of Galactic TeV gamma-ray sources newly detected with
the H.E.S.S. telescope system, HESS J1841-053 is the only object which shows an
extended, bipolar TeV morphology, together with an X-ray binary at the core of
the source. We propose to use Chandra observations on the lobes of HESS J1841-053
to identify the nature of the TeV source and to verify its association with the
central object. If the suggested identification holds, HESS J1841-053 would
represent a new type of X-ray/TeV source.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  18:39:25.00  -05:48:20.00     HESS J1841-053-SW     ACIS-I    NONE    20.0000 
  18:41:60.00  -05:22:04.00     HESS J1841-053-NE     ACIS-I    NONE    20.0000 

==========================================================================================


Proposal Number: 08400583            

Proposal Title: Bright edge-on LMXB transients to map ionized disk atmospheres

PI: Laurence Boirin                

Subject Category: BH AND NS BINARIES                                

Abstract: With the discovery of Fe XXV and Fe XXVI lines in several binaries
viewed close to the disk plane, XMM and Chandra have revealed the existence of a
highly-ionized atmosphere above the accretion disk. We have further demonstrated
that the spectral changes during dips from dipping LMXBs, both in the lines and
in the continuum could be explained by a decrease in the ionization level of this
plasma. We want to investigate the presence of such a highly ionized plasma in
three other binaries viewed close to the disk plane should these currently quiet
transient sources turn on. We wish to constrain the plasma properties (location
in binary, stationary or outflow) as a function of binary parameters
(inclination, period) and luminosity.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  17:02:06.50  -29:56:44.10     MXB 1659-298          ACIS-S    HETG    90.0000 
  17:58:40.00  -33:48:27.00     4U 1755-33            ACIS-S    HETG    90.0000 
  21:31:26.20  +47:17:02.00     4U 2129+47            ACIS-S    HETG    90.0000 

==========================================================================================


Proposal Number: 08400666            

Proposal Title: Precise Localization of Neutron Star Soft X-ray Transients

PI: Deepto Chakrabarty             

Subject Category: BH AND NS BINARIES                                

Abstract: We propose to observe four neutron star (NS) soft X-ray transients in
outburst to obtain accurate source positions, continuing a successful program
from the previous 2 cycles. This continuing study will allow us to reobserve such
sources in future cycles to study the quiescent X-ray emission in NS SXTs. Recent
results from Chandra and XMM suggest that the standard picture of NS SXT emission
may not be as straightforward as previously thought. This proposal will increase
the number of known SXTs with good positions, providing a more uniform sample of
the population for future work.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
                                NS SXT                HRC-S     NONE    1.0000 
                                NS SXT                HRC-S     NONE    1.0000 
                                NS SXT                HRC-S     NONE    1.0000 
                                NS SXT                HRC-S     NONE    1.0000 

==========================================================================================


Proposal Number: 08400682            

Proposal Title: The Ring of Fire: Constraining the jet power of Cygnus X-1 from
its shocked shell.

PI: Sebastian Heinz                

Subject Category: BH AND NS BINARIES                                

Abstract: We propose a 50ksec ACIS-I oservation of the shocked radio shell
recently found around the black hole X-ray binary Cyg X-1. This shell has been
interpreted as the swept up ISM that is pushed aside by a bubble of relativistic
gas inflated by the jet of Cyg X-1. Detecting the shock in soft X-ray and
measuring its temperature and emission measure will allow us to confirm the
jet-origin of the shell and, for the first time, to unambiguously measure the
average jet power of Cyg X-1. In order to properly model and subtract the diffuse
emission from the dust scattering halo and the wings of the PSF we also propose a
simultaneous 5ksec RXTE observation of the point source.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  19:58:06.60  +35:20:08.00     Cygnus X-1            ACIS-I    NONE    50.0000 

==========================================================================================


Proposal Number: 08400741            

Proposal Title: Understanding the nature of high inclination low mass X-ray
binaries: broad-band and line spectra from A1744-361

PI: Tod Strohmayer                 

Subject Category: BH AND NS BINARIES                                

Abstract: We propose to observe the transient dipping LMXB system A1744-361
during an outburst with Chandra HETGS, and contemporaneously with RXTE PCA. This
will be the first observation of A1744-361 with a high resolution spectral
instrument, and will facilitate; (1) sigficant detection of narrow spectral lines
for the first time from A1744-361, (2) detection and line profile measurement of
its broad iron emisson line, (3) unambiguous determination of source orbital
period, (4) unambiguous determination of source position, (5) sigficant detection
of kHz QPOs, and (6) understanding of the ionized plasma in the immediate
environs of A1744-361, and dippers in general. These science goals rely on the
unique qualities of Chandra (e.g., high spectral and angular resolution) and
RXTE.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  17:48:13.10  -36:07:58.20     A1744-361             ACIS-S    HETG    80.0000 

==========================================================================================


Proposal Number: 08400768            

Proposal Title: Supergiant Fast X-ray Transients: New Candidates and
Characterization of Quiescence

PI: David Smith                    

Subject Category: BH AND NS BINARIES                                

Abstract: Supergiant fast x-ray transients (SFXTs) are a recently-discovered
class of high-mass x-ray binary with extremely short, hard x-ray outbursts
(lasting for hours) and blue supergiant companions. They are difficult to
discover, so the class has only now begun to grow, based on monitoring of the
Galactic plane by INTEGRAL and RXTE. Some of the systems contain pulsars; perhaps
all contain neutron stars. Very little is known about the emission outside of
outburst. Here we propose a systematic study of emission in quiescence (or at
least in intervals chosen at random, which might also contain outbursts). We also
propose brief pointings to discover or confirm the counterparts to several
systems which are candidates for the SFXT class.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  11:21:46.90  -59:51:42.00     IGR J11215-5952       ACIS-S    NONE    5.0000 
  12:47:35.00  -60:38:34.00     1A 1244-60            ACIS-I    NONE    5.0000 
  17:49:06.00  -27:33:00.00     AX J1749.1-2733       ACIS-S    NONE    5.0000 
  18:45:02.11  -04:33:55.08     AX 1845.0-0433        ACIS-S    NONE    5.0000 

==========================================================================================


Proposal Number: 08400783            

Proposal Title: Monitoring Faint X-ray Transients in the Galactic Center

PI: Frederick Baganoff             

Subject Category: BH AND NS BINARIES                                

Abstract: We propose eight 5-ks ACIS-I observations of the SgrA* field to monitor
the rate of faint X-ray transients in the central 25 pc of the Galaxy. This
region contains 0.1% of the Galactic stellar mass, making it an ideal location
for studying faint X-ray transients. In 6 years of Chandra observations, we have
detected 7 transients with luminosities greater than 5e+33 erg/s, indicating that
they are either HMXBs or LMXBs containing a black hole or neutron star.
Remarkably, 4 of the transients are located within 1 pc of SgrA*, 20 times
overabundant per unit stellar mass. This may be evidence for a cluster of several
tens of thousands of black holes and neutron stars swarming around the Galactic
supermassive black hole, as predicted by Morris (1993) and Miralda-Escude & Gould
(2000).

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  17:45:40.00  -29:00:28.00     Sgr A*                ACIS-I    NONE    5.0000 
  17:45:40.00  -29:00:28.00     Sgr A*                ACIS-I    NONE    5.0000 
  17:45:40.00  -29:00:28.00     Sgr A*                ACIS-I    NONE    5.0000 
  17:45:40.00  -29:00:28.00     Sgr A*                ACIS-I    NONE    5.0000 
  17:45:40.00  -29:00:28.00     Sgr A*                ACIS-I    NONE    5.0000 
  17:45:40.00  -29:00:28.00     Sgr A*                ACIS-I    NONE    5.0000 

==========================================================================================


Proposal Number: 08400789            

Proposal Title: Transient LMXBs in Globular Clusters: More Numerous Than We
Thought?

PI: David Pooley                   

Subject Category: BH AND NS BINARIES                                

Abstract: Since the discovery of globular cluster LMXBs in the 1970s, it was
assumed that there was only one bright LMXB per cluster. Deep Chandra
observations of several globular clusters have revealed that they contain
numerous quiescent LMXB systems, any of which could go into outburst. Our
observations will determine whether new outbursts from transient LMXBs in NGC
6440, Terzan 5, and Terzan 1 are from the same sources that were previously seen
in outburst.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  17:35:47.20  -30:28:54.00     Terzan 1              ACIS-S    NONE    10.0000 
  17:48:04.90  -24:46:45.00     Terzan 5              ACIS-S    NONE    10.0000 
  17:48:52.70  -20:21:37.00     NGC 6440              ACIS-S    NONE    2.5000 

==========================================================================================


Proposal Number: 08400850            

Proposal Title: A Chandra HETGS Study of LMC X-4 : Binary Disk and Wind
Properties and Studies of Grain Distribution at Small Angles

PI: Julia Lee                      

Subject Category: BH AND NS BINARIES                                

Abstract: We propose a 150 ks (~ a binary period) HETGS observation of LMC X-4 at
a median-to-high flux state to facilitate several independent science goals: (1)
to study the physics of the companion wind feeding the disk, (2) to study the
disk atmosphere and putative wind causing the super-orbital variation, and (3) to
study small angle scattering of the X-ray halo to diagnose ISM grain properties
(the line-of-sight position, size distribution and density of grains) in the
LMC.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  05:32:49.80  -66:22:13.80     LMC X-4               ACIS-S    HETG    150.0000 

==========================================================================================


Proposal Number: 08400891            

Proposal Title: Confirming the Structure of the Nebular Trail of PSR J1614-2230

PI: Mallory Roberts                

Subject Category: BH AND NS BINARIES                                

Abstract: The 3.15ms pulsar PSR J1614-2230 was discovered during a recent radio
survey of unidentified EGRET gamma-ray sources. It is the first true millisecond
pulsar detected with a companion whose minimum mass is as large as 0.4 solar
masses. A short (5ks), exploratory XMM-Newton observation revealed it to be an
X-ray source with an apparent extended nebular trail. Here we request a 20ks
Chandra ACIS-S observation to image the structure of the nebular trail which will
complement spectral studies to be performed with an already accepted deeper
(50ks) observation by XMM-Newton.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  16:14:36.50  -22:30:31.20     PSR J1614-2230        ACIS-S    NONE    20.0000 

==========================================================================================


Proposal Number: 08400900            

Proposal Title: Spectroscopy of a bright burst from 4U 1812-12

PI: Johannes in 't Zand            

Subject Category: BH AND NS BINARIES                                

Abstract: Our goal is to measure with the HETGS a bright type-I X-ray burst with
photospheric radius expansion (PRE), search for signatures of the ashes of
nuclear burning and, if succesful, attempt a measurement of the gravitational
redshift. The target, 4U 1812-12, is an ultracompact X-ray binary whose bursts
are known to be consistently very bright, show strong PRE and are fairly
predictable in occurrence. We request a joint RXTE observation to measure the
neutron star spin via burst oscillations.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  18:15:06.20  -12:05:46.70     4U 1812-12            ACIS-S    HETG    86.0000 

==========================================================================================


Proposal Number: 08400908            

Proposal Title: Measuring the Distance and Dust Distribution to Cen X-3 with
X-Ray Halo Variability

PI: Thomas Thompson                

Subject Category: BH AND NS BINARIES                                

Abstract: X-ray halos can provide information on interstellar grain properties
(size, density, composition) and on the spatial distribution along the line of
sight. Eclipsing X-ray binary systems, in particular, offer unique advantages, as
the evolution of the halo following an abrupt eclipse is the easiest to model,
and this variability can be used to measure the source distance. We propose to
observe Cen X-3, beginning ~5 ks before eclipse egress and ending ~35 ks after
eclipse egress. The X-ray halo variability will be used to determine the distance
and dust distribution to Cen X-3, and will also probe the spatial relationship
between gas and dust along the line of sight.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  11:21:15.80  -60:37:22.70     Cen X-3               ACIS-S    NONE    40.0000 

==========================================================================================


Proposal Number: 08400979            

Proposal Title: X-raying the faintest black hole binaries

PI: Elena Gallo                    

Subject Category: BH AND NS BINARIES                                

Abstract: We propose deep Chandra observations of two nearby quiecsent black hole
binaries, in order to test whether 1e30 erg/sec is a limiting luminosity for
short orbital period quiescent systems.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  16:50:01.00  -49:57:45.00     XTE J1650-500         ACIS-S    NONE    37.0000 

==========================================================================================


Proposal Number: 08400982            

Proposal Title: From Super-Eddington to zero: following a Z source into
quiescence

PI: Jeroen Homan                   

Subject Category: BH AND NS BINARIES                                

Abstract: XTE J1701-462 is likely the most luminous Galactic transient neutron
star LMXB (NSXB) in the history of X-ray astronomy. Early observations have
already challenged our view on the role of mass accretion rate in NSXBs.
Observing XTE J1701-462 as it returns to quiescence creates a unique opportunity
to study the effects of mass-accretion rate on the spectral/variability
properties in a single NSXB over an unprecedented luminosity range. We propose a
Chandra/XMM-Newton TOO program with two goals: 1) observe the source during the
end of the decay and in quiescence, to complete what might well become a 'Rosetta
stone' for NSXBs and 2) constrain the structure of neutron stars by studying the
effects of super-Eddington accretion on the cooling of the crust/core in
transient NSXBs.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  17:00:56.00  -46:10:07.00     XTE J1701-462         ACIS-S    NONE    5.0000 
  17:00:56.00  -46:10:07.00     XTE J1701-462         ACIS-S    NONE    10.0000 
  17:00:56.00  -46:10:07.00     XTE J1701-462         ACIS-S    NONE    20.0000 
  17:00:56.00  -46:10:07.00     XTE J1701-462         ACIS-S    NONE    30.0000 
  17:00:56.00  -46:10:07.00     XTE J1701-462         ACIS-S    NONE    40.0000 

==========================================================================================


Proposal Number: 08401029            

Proposal Title: Localization and Spectra of INTEGRAL-Selected Sources in the
Galactic Plane

PI: John Tomsick                   

Subject Category: BH AND NS BINARIES                                

Abstract: The INTEGRAL satellite is discovering a large number of new hard X-ray
sources in the Galactic plane. In most cases, the few arcminute INTEGRAL
positions do not allow for identification of these IGR sources at other
wavelengths, leaving their nature unclear. Chandra can make a major contribution
to studies of IGR sources by localizing the sources to allow for the
identification of multi-wavelength counterparts and by constraining their soft
X-ray spectra. Many of the IGR sources that have been identified are High-Mass
X-ray Binaries (HMXBs) with interesting properties. We propose for relatively
short Chandra observations of 20 unidentified IGR sources in the Galactic plane
to search for HMXBs or other unusual Galactic sources.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  00:23:24.00  +61:41:31.20     IGR J00234+6141       ACIS-S    NONE    5.0000 
  01:36:18.00  +66:10:37.20     IGR J01363+6610       ACIS-S    NONE    5.0000 
  06:07:24.00  +22:04:58.80     IGR J06074+2205       ACIS-S    NONE    5.0000 
  09:02:33.10  -48:11:45.60     IGR J09026-4812       ACIS-S    NONE    5.0000 
  10:10:07.80  -56:54:46.40     IGR J10101-5654       ACIS-S    NONE    5.0000 
  11:30:30.00  -62:55:51.60     IGR J11305-6256       ACIS-I    NONE    5.0000 
  11:43:52.00  -61:08:60.00     IGR J11435-6109       ACIS-S    NONE    5.0000 
  14:51:32.90  -55:42:16.20     IGR J14515-5542       ACIS-S    NONE    5.0000 
  17:20:05.30  -31:17:24.00     IGR J17200-3116       ACIS-S    NONE    5.0000 
  17:28:41.30  -29:22:55.20     IGR J17285-2922       ACIS-S    NONE    5.0000 
  17:33:08.00  -24:06:46.10     IGR J17331-2406       ACIS-S    NONE    5.0000 
  17:40:42.00  -28:07:58.80     IGR J17407-2808       ACIS-S    NONE    5.0000 
  17:44:31.70  -27:46:58.80     IGR J17445-2747       ACIS-S    NONE    5.0000 
  17:50:44.00  -28:56:17.20     IGR J17507-2856       ACIS-S    NONE    5.0000 
  18:19:16.80  -25:42:10.80     IGR J18193-2542       ACIS-S    NONE    5.0000 
  18:21:21.60  -13:18:28.80     IGR J18214-1318       ACIS-S    NONE    5.0000 
  18:25:37.40  -10:35:13.20     IGR J18256-1035       ACIS-S    NONE    5.0000 
  18:25:56.40  -07:06:21.60     IGR J18259-0706       ACIS-S    NONE    5.0000 
  18:32:28.30  -07:56:24.00     IGR J18325-0756       ACIS-S    NONE    5.0000 
  18:53:54.50  +07:27:28.80     IGR J18539+0727       ACIS-S    NONE    5.0000 

==========================================================================================


Proposal Number: 08401035            

Proposal Title: Faint persistent X-ray sources in the Galactic Bulge

PI: Marc Klein-Wolt                

Subject Category: BH AND NS BINARIES                                

Abstract: We propose short (1 ksec) observations with the HRC-I of a selection of
faint persistent X-ray sources in the Galactic Bulge for which very little is
know. These sources are detected in the PCA/RXTE bulge scan project at
luminosities below 10^36 erg/sec and are most likely HMXB or LMXB; they are
either Be/X-ray binaries, and hence candidates to show slow X-ray pulsations, or
they are ultra-compact binaries in which the compact object is accreting from a
degenarate donor and in which case they are candidates to show gravitational
waves. The HRC observations will allow us to search for slow pulsations as well
give for the first time an accurate position that will allow for optical/IR
follow-up studies to determine the binary parameters.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  17:10:12.00  -28:07:05.90     XTE J1710-281         HRC-I     NONE    1.0000 
  17:12:34.10  -37:38:35.90     SAX J1712.6-3739      HRC-I     NONE    1.0000 
  17:17:25.60  -40:45:43.90     XTE J1717-407         HRC-I     NONE    1.0000 
  17:28:37.70  -29:09:25.20     XTE J1728-295         HRC-I     NONE    1.0000 
  17:33:08.00  -24:06:46.10     IGR J17331-2406       HRC-I     NONE    1.0000 
  17:44:08.40  -23:07:19.20     XTE J1744-230         HRC-I     NONE    1.0000 
  17:52:48.00  -28:00:00.00     XTE J1752-280         HRC-I     NONE    1.0000 
  18:05:37.10  -29:31:15.20     XTE J1805-295         HRC-I     NONE    1.0000 
  18:08:24.50  -23:09:17.60     RXS J180824.5         HRC-I     NONE    1.0000 
  18:12:48.00  -23:00:00.00     XTE J1812-230         HRC-I     NONE    1.0000 
  18:38:01.00  -06:55:55.20     AXJ183800-0655        HRC-I     NONE    1.0000 

==========================================================================================


Proposal Number: 08401042            

Proposal Title: Spitzer-Chandra ToO Observations of a Short/Hard GRB

PI: Kevin Hurley                   

Subject Category: BH AND NS BINARIES                                

Abstract: We propose an ambitious multiwavelength approach to the short GRB
mystery, leveraging Spitzer with Chandra as well as numerous ground-based
telescopes. By measuring the broad-band spectrum of the afterglow and any
concurrent "mini-supernova" over a wide range of wavelengths at several epochs,
we can distinguish between models proposed to explain this type of burst. We will
constrain the energetics of the explosion, constrain the short GRB bursting rate
(an important number for gravitational wave observatories), and measure with
unprecedented detail the stellar content of a short burst host galaxy. Given the
high impact nature of these observations and the rarity of short bursts, we are
requesting multiepoch ToO observations on a single event in Spitzer Cycle
3/Chandra Cycle 8.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
                                Short GRB             ACIS-S    NONE    10.0000 
                                Short GRB             ACIS-S    NONE    20.0000 


******************************************************************************************

 
SN, SNR AND ISOLATED NS                           


******************************************************************************************

==========================================================================================


Proposal Number: 08500003            

Proposal Title: A new magnetar in a young supernova remnant

PI: Bryan Gaensler                 

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: Anomalous X-ray Pulsars (AXPs) are an exotic population of pulsating
X-ray sources, which are now thought to be highly magnetized neutron stars
("magnetars"). However, the evolution, demography, and relation of magnetars to
other types of neutron star are all not yet understood. We have identified a new
candidate association between an AXP and a young supernova remnant (SNR), for
which we propose XMM and Chandra observations. These data can confirm our AXP and
SNR identifications, and can thus help constrain the origin, evolution and
physical properties of the magnetar population.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  15:50:54.00  -54:18:25.20     1E 1547.0-5408        ACIS-I    NONE    10.0000 

==========================================================================================


Proposal Number: 08500010            

Proposal Title: A Search for Jet Breaks in Long GRB afterglows

PI: Gordon Garmire                 

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: In the standard 'fireball' model for GRB afterglows, the jet opening
angle can be determined from the jet break time. Previous studies have found jet
break times of the order of a few days, implying jet angles of < 5 degrees.
Surprisingly, the X-ray light curves observed by Swift seem to be in conflict
with earlier results, with no observable jet break for many bursts in the first
10 days. This implies far less collimation than previously thought, and has a
strong impact on the derived explosion energies. In order to search for late jet
breaks, we propose to follow 4 carefully chosen GRB afterglows with late-time
observations by Chandra.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
                                GRB xxxxxx            ACIS-S    NONE    12.0000 
                                GRB xxxxxx            ACIS-S    NONE    12.0000 
                                GRB xxxxxx            ACIS-S    NONE    12.0000 
                                GRB xxxxxx            ACIS-S    NONE    12.0000 
                                GRB xxxxxx            ACIS-S    NONE    25.0000 
                                GRB xxxxxx            ACIS-S    NONE    25.0000 
                                GRB xxxxxx            ACIS-S    NONE    25.0000 
                                GRB xxxxxx            ACIS-S    NONE    25.0000 
                                GRB xxxxxx            ACIS-S    NONE    50.0000 
                                GRB xxxxxx            ACIS-S    NONE    50.0000 
                                GRB xxxxxx            ACIS-S    NONE    50.0000 
                                GRB xxxxxx            ACIS-S    NONE    50.0000 

==========================================================================================


Proposal Number: 08500019            

Proposal Title: The very old nearby pulsar J0108-1431

PI: Gordon Garmire                 

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose to image the field around PSR J0108-1431 to detect this very
old pulsar or determine an upper limit on its X-ray flux.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  01:08:08.30  -14:31:48.50     PSR J0108-1431        ACIS-I    NONE    30.0000 

==========================================================================================


Proposal Number: 08500022            

Proposal Title: X-ray Emission from the Planet Pulsar

PI: Gordon Garmire                 

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: PSR 1257+12 is the famous millisecond pulsar with a planetary system.
We observed this pulsar with Chandra in 2005 and detected a surprisingly low
X-ray flux. A possible interpretaion of the the low flux is that the pulsar's
X-rays are absorbed by clouds of circumpulsar matter orbiting the pulsar. To
check this hypothesis, we propose to monitor the pulsar with Chandra.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  13:00:03.00  +12:40:57.30     PSR B1257+12          ACIS-S    NONE    20.0000 

==========================================================================================


Proposal Number: 08500023            

Proposal Title: Chandra monitoring of the candidate Anomalous X-ray Pulsar AX
J1845-0258

PI: Gordon Garmire                 

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose to monitor the flux of the transient Anomalous X-ray Pulsar
candidate AX J1845-0258 with Chandra ACIS.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  18:44:54.60  -02:56:53.00     AX J1845-0258         ACIS-I    NONE    5.0000 
  18:44:54.60  -02:56:53.00     AX J1845-0258         ACIS-I    NONE    5.0000 
  18:44:54.60  -02:56:53.00     AX J1845-0258         ACIS-I    NONE    5.0000 
  18:44:54.60  -02:56:53.00     AX J1845-0258         ACIS-I    NONE    5.0000 
  18:44:54.60  -02:56:53.00     AX J1845-0258         ACIS-I    NONE    5.0000 
  18:44:54.60  -02:56:53.00     AX J1845-0258         ACIS-I    NONE    5.0000 

==========================================================================================


Proposal Number: 08500024            

Proposal Title: NEARBY RECYCLED PULSAR J1909-3744

PI: Gordon Garmire                 

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: PSR J1909-3744 is expected to be among the top five X-ray brightest
recycled pulsars. Its proximity and relatively high spin-down power make it a
promising target for studying the X-ray properties of very old recycled pulsars
including thermal radiation from hot polar caps and non-thermal radiation from
magnetospheres.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  19:09:47.50  -37:44:14.20     PSR J1909-3744        ACIS-S    NONE    30.0000 

==========================================================================================


Proposal Number: 08500044            

Proposal Title: Exploring the center-filled SNR G67.7+1.8

PI: Peter Predehl                  

Subject Category: SN, SNR AND ISOLATED NS                           


                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  19:54:26.00  +31:28:54.00     G67.7+1.8             ACIS-I    NONE    30.0000 

==========================================================================================


Proposal Number: 08500045            

Proposal Title: High resolution investigation of possible cyclotron absorption
line harmonics from RX J1605.3+3249

PI: Peter Predehl                  

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: RX J1605.3+3249 is member of a class of isolated neutron stars which
show a thermal X-ray spectrum. Broad absorption lines in the X-ray spectra of
most of these objects were discovered which is interpreted as resonant absorption
at the proton cyclotron energy. EPIC-pn spectra show strong evidence for harmonic
absorption lines with energy ratios of 2:3:4 with the lowest-energy line at ~400
eV. We propose to use the unique low energy capability of the LETGS in order to
confirm the multiple absorption lines and their expected fundamental at 200 eV.
The detection of harmonic lines would be unique among the isolated neutron stars
with purely thermal emission and extremely important for understanding their
underlying physical mechanisms.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  16:05:18.50  +32:49:18.00     RX J1605.3+3249       HRC-S     LETG    100.0000 

==========================================================================================


Proposal Number: 08500060            

Proposal Title: HETG Spectroscopy of the Crab Pulsar and the Interstellar Medium

PI: Claude Canizares               

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose a 50 ks HETG-ACIS observation of the Crab pulsar. The
excellent ACIS spatial resolution will enable us for the first time to obtain a
"clean" grating spectrum of the pulsar itself. Although we will obtain an image
of the pulsar, it will be pilled-up, as our observing strategy is to obtain a
high quality grating spectrum. Rather, we intend to verify the evidence for an
expanding remnant shell that has been marginally detected in the existing
calibration observations. The proposed observation will also allow us to study
the X-ray Absorption Fine Structure in the interstellar medium.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  05:34:31.90  +22:00:52.10     Crab Pulsar           ACIS-S    HETG    50.0000 

==========================================================================================


Proposal Number: 08500065            

Proposal Title: High resolution spectral imaging of SN 1987A at 20 years: HETG
observation

PI: Claude Canizares               

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose deep, high-resolution observations of SN 1987A at ~ 20 years
after its explosion. Here we use 270 ks of HETGS observation time to provide the
highest-resolution spectra of this target over the band from the O VII triplet (~
0.55 keV, 22 A) to the Fe-K line region (~ 6-7 keV, 1.9 A). Because SN 1987A is
brightening at an accelerating rate we will obtain several hundred counts in
individual line-images, e.g., Si XIII and Ne X lines. To maximize the science
value of these data, we are teaming on a parallel proposal (McCray, P.I.) to
obtain a similarly deep LETG/ACIS data set. With the full set of deep line-images
- over a range of 5 in dispersion and a a range of ~4 in wavelength - we can do
detailed fitting of spatial-velocity-ionization models of SN 1987A.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  05:35:28.00  -69:16:11.00     Sn 1987A              ACIS-S    HETG    50.0000 
  05:35:28.00  -69:16:11.00     Sn 1987A              ACIS-S    HETG    160.0000 
  05:35:28.00  -69:16:11.00     Sn 1987A              ACIS-S    HETG    160.0000 

==========================================================================================


Proposal Number: 08500067            

Proposal Title: Chandra Search for Young Neutron Stars

PI: Stephen Murray                 

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose a search for young, active neutron stars, their nebulae, and
associated supernova remnants based on a list of candidate sources whose emission
in other wavelength bands is consistent with such an origin.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  16:40:47.60  -46:31:60.00     HESS J1640-465        ACIS-I    NONE    30.0000 

==========================================================================================


Proposal Number: 08500140            

Proposal Title: The Puzzling Pulsar-Wind Nebula of the Geminga Pulsar

PI: George Pavlov                  

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: XMM and Chandra observations have shown a unique structure around the
Geminga pulsar. The XMM images show two 2'-long, patchy tails extended in the
direction opposite to the pulsar's proper motion. Our observation with Chandra
ACIS revealed a 20''-long axial tail behind the moving pulsar and an arc-like
structure 5''-7'' ahead of the pulsar. The tail could be a pulsar jet or a
shocked pulsar wind confined by the ram pressure of the oncoming medium. The arc
could be the head of a bow shock or a torus of the shocked equatorial pulsar
wind. In the shallow ACIS image there is no clear connection between these
small-scale structures and the long tails seen in the XMM images. The proposed
deep observation will establish this connection and allow us to understand the
nature of the whole nebula.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  06:33:54.20  +17:46:12.90     Geminga               ACIS-I    NONE    80.0000 

==========================================================================================


Proposal Number: 08500177            

Proposal Title: Can We Observe the SGR to AXP Transition in Real Time?

PI: C. Wilson                      

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: Soft Gamma Repeaters (SGRs) and Anomalous X-ray Pulsars (AXPs) are both
believed to be magnetars powered by the decay of their strong magnetic fields.
Within the last 8 years, giant flares have been recorded from two Soft Gamma
Repeaters, SGR 1900+14 and SGR 1806-20. During these flares, the external field
is significantly altered creating measureable changes in the persistent X-ray
flux, energy spectrum and burst activity. These changes point toward a reduction
in magnetospheric currents that may hasten the transition from an SGR-like state
to an AXP-like state on a time scale of years. Here, we propose to observe each
of these SGRs to monitor this transition and constrain the physical impact of
giant flares on the underlying X-ray source and probe the flare mechanism
itself.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  19:07:14.30  +09:19:20.10     SGR 1900+14           ACIS-S    NONE    12.5000 
  19:07:14.30  +09:19:20.10     SGR 1900+14           ACIS-S    NONE    12.5000 

==========================================================================================


Proposal Number: 08500205            

Proposal Title: New Developments from the Transient AXP XTE J1810-197

PI: JULES HALPERN                  

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The 5.5 s pulsar XTE J1810-197 is the first confirmed Transient
Anomalous X-ray Pulsar (TAXP). It has been fading steadily since its only known
outburst in 2003. Archival data spanning 25 yr indicates that this is likely a
one-time event. Monitoring of its complex spectrum and pulse profiles during the
decay is revealing a wealth of information about emission mechanisms and geometry
of a magnetar. Surprising radio brightening, 1-3 years after outburst, is unique
to this AXP, and suggests either an expanding nebula or transient radio bursts.
During AO8, we expect the X-ray spectrum and pulse modulation to change markedly
as the source returns to its quiescent state. We propose to follow its flux,
spin, and spectral evolution, and search for a radio and X-ray nebula.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  18:09:51.10  -19:43:51.70     XTE J1810-197         ACIS-S    NONE    30.0000 

==========================================================================================


Proposal Number: 08500247            

Proposal Title: ToO Observations of Isolated Neutron Stars

PI: Peter Woods                    

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: Phase-coherent timing solutions for two Isolated Neutron Stars (INSs)
were recently established and the inferred magnetic field strengths are
intermediate between ordinary radio pulsars and magnetars. Interestingly, strong
timing noise, spectral variability, and pulse morphology changes were observed in
RX J0720.4-3125 -- characteristics commonly seen in magnetars. Given the strong
timing noise seen in this object, there is a reasonable expectation that it may
glitch. Transient flux variability may also be seen if the X-ray emission is
powered by magnetic dissipation. Here, we propose a sequence of ToO observations
should either source glitch or change brightness by more than 50%. These
observations will allow us to establish a new timing solution and/or quantify
spectral changes.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  07:20:25.00  -31:25:49.60     RX J0720.4-3125       ACIS-S    NONE    5.0000 
  07:20:25.00  -31:25:49.60     RX J0720.4-3125       ACIS-S    NONE    5.0000 
  07:20:25.00  -31:25:49.60     RX J0720.4-3125       ACIS-S    NONE    5.0000 
  07:20:25.00  -31:25:49.60     RX J0720.4-3125       ACIS-S    NONE    10.0000 
  13:08:48.30  +21:27:06.80     RX J1308.6+2127       ACIS-S    NONE    5.0000 
  13:08:48.30  +21:27:06.80     RX J1308.6+2127       ACIS-S    NONE    5.0000 
  13:08:48.30  +21:27:06.80     RX J1308.6+2127       ACIS-S    NONE    5.0000 
  13:08:48.30  +21:27:06.80     RX J1308.6+2127       ACIS-S    NONE    10.0000 

==========================================================================================


Proposal Number: 08500282            

Proposal Title: Complex PWN Torus and Jets from a Gamma-ray Pulsar

PI: Roger Romani                   

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose a deep ACIS image of the PWN discovered around PSR
J2021+3651 in a short AO4 observation. The nebula of this energetic pulsar is
interesting as it seems to show the complex `double torus' structure only
previously seen clearly around Vela. The pulsar itself is also interesting as it
is a probable gamma-ray source, yet the large radio pulsar DM distance implies an
enormous efficiency. The proposed deep imaging campaign addresses these issues,
allowing both geometrical and spectral tests of the pulsar distance and measuring
the PWN equatorial tori and jets in sufficient detail to allow comparison with
pulsar wind models.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  20:21:04.50  +36:51:27.00     PSR J2021+3651        ACIS-S    NONE    100.0000 

==========================================================================================


Proposal Number: 08500333            

Proposal Title: CHANDRA OBSERVATIONS OF YOUNG ENERGETIC SUPERNOVAE

PI: David Pooley                   

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: In the entire history of X-ray astronomy, only about two dozen
core-collapse supernovae (SNe) have been detected at ages of days to years old.
Of these, only a handful have been well-followed temporally. Few general trends
have emerged, and there is a clear need for better X-ray coverage at ages of
~years. Two SN subclasses stand out as deserving of particular attention, namely,
the type Ic SNe, which have been associated with long-duration gamma-ray bursts,
and the type IIn SNe, which are very poorly understood but have the highest X-ray
luminosities seen in SNe. We propose observations of a number of interesting SNe
of these subclasses at ages between one and five years.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  00:41:26.80  +25:29:51.60     SN 2005db             ACIS-S    NONE    3.0000 
  03:21:39.70  +16:52:01.80     SN 2006aj             ACIS-S    NONE    20.0000 
  04:10:59.40  -31:24:50.30     SN 2003bg             ACIS-S    NONE    35.0000 
  11:27:29.70  +56:52:48.20     SN 2004C              ACIS-S    NONE    60.0000 
  13:50:25.00  +68:33:19.40     SN 2005bx             ACIS-S    NONE    13.0000 
  21:42:23.70  +12:29:50.90     SN 2001em             ACIS-S    NONE    5.0000 

==========================================================================================


Proposal Number: 08500339            

Proposal Title: Astrometric Study of Isolated Neutron Stars

PI: Christian Motch                

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose to take advantage of the excellent imaging performance of
Chandra to measure the proper motion of the X-ray bright and radio-quiet isolated
neutron star RX J1308.6+2127 with the goal to constrain its space velocity, birth
place and age. The five year time interval between the proposed Cycle 8 and
former Cycle 3 observations obtained by our group will provide a very sensitive
measurement.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  13:08:48.20  +21:27:06.80     RX J1308.6+2127       ACIS-I    NONE    20.0000 

==========================================================================================


Proposal Number: 08500365            

Proposal Title: ToO Observations of Soft Gamma Repeaters

PI: Peter Woods                    

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: Soft Gamma Repeaters are rare sources of transient burst emission,
probably magnetars (i.e. strongly magnetized neutron stars). Each of the SGRs has
a persistent X-ray counterpart and some show coherent pulsations. During burst
active phases, these counterparts undergo changes in their energy spectrum and
pulse properties. Measuring the effects of burst activity are diagnostic of the
burst mechanism and SGRs in general. In the event of detection of substantial
burst activity from an SGR, we propose to make Chandra ToO observations of any of
the four known sources, SGR 1900+14, SGR 1806-20, SGR 1627-41, SGR 0526-66, the
SGR candidate SGR 1801-23, as well as any newly discovered SGR source.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
                                NEW SGR               ACIS-I    NONE    5.0000 
                                NEW SGR               ACIS-S    NONE    40.0000 
  05:26:01.10  -66:04:38.00     SGR 0526-66           ACIS-S    NONE    40.0000 
  16:35:51.80  -47:35:23.30     SGR 1627-41           ACIS-S    NONE    40.0000 
  18:00:58.90  -22:56:48.50     SGR 1801-23           ACIS-S    NONE    40.0000 
  18:08:39.30  -20:24:39.50     SGR 1806-20           ACIS-S    NONE    40.0000 
  19:07:14.30  +09:19:20.10     SGR 1900+14           ACIS-S    NONE    40.0000 

==========================================================================================


Proposal Number: 08500437            

Proposal Title: X-rays from the unusual relativistic binary J1906+0746

PI: Oleg Kargaltsev                

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: PSR J1906+0746 is a recently discovered pulsar in a tight binary
(orbital period 3.98 hours) where the second component is either a heavy WD or a
NS. The binary is unique because PSR J1906+0746 is young and energetic compared
to the pulsars in other tight NS-NS or NS-WD binaries. It has been suggested that
in such binaries the interaction between the pulsar wind and the companion can
significantly enchance X-ray emission and result in variability with orbital
phase. J1906+0746 is an ideal system for testing this hypothesis. We propose an
exploratory observation to measure the fluxes of different emission components,
resolve the extended PWN and search for variability with orbital phase.

                                                                Grat-      Exp. 
     R.A.        Dec. (J2000)    Target Name            Det.     ing       Time 
-----------------------------------------------------------------------------------
  19:06:48.70  +07:46:28.60     PSRJ1906+0746         ACIS-I    NONE    32.0000 

==========================================================================================


Proposal Number: 08500515            

Proposal Title: A search for fast periodicity in the enigmatic X-ray source
inside RCW103.

PI: Andrea De Luca                 

Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: 1E161348-5055 is a compact, radio-quiet X-ray source lying at the
center of the 2000-year old supernova remnant RCW103. Its original identification
as an isolated neutron star was questioned in recent years by the detection of
long-term flux variations. A very recent, long XMM-Newton observation performed
in August 2005 by our group led to the unambiguous evidence of a 6.67 hours
periodicity, settling the case for a unique phenomenology. 1E161348-5055 cannot
be easily identified with any currently known class of X-ray sources. Here we ask
for an 80 ks observation with Chandra/HRC-S in Timing mode. The unique
combination of angular and time resolution will allow to perform the first
sensit
Chandra Cycle 8 Science Programs

Projects are grouped into the following categories.
